1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2016 Namjae Jeon <linkinjeon@kernel.org> 4 * Copyright (C) 2018 Samsung Electronics Co., Ltd. 5 */ 6 7 #include <crypto/sha2.h> 8 #include <linux/kernel.h> 9 #include <linux/fs.h> 10 #include <linux/filelock.h> 11 #include <linux/uaccess.h> 12 #include <linux/backing-dev.h> 13 #include <linux/writeback.h> 14 #include <linux/xattr.h> 15 #include <linux/falloc.h> 16 #include <linux/fsnotify.h> 17 #include <linux/dcache.h> 18 #include <linux/slab.h> 19 #include <linux/vmalloc.h> 20 #include <linux/sched/xacct.h> 21 #include <linux/crc32c.h> 22 #include <linux/splice.h> 23 #include <linux/fileattr.h> 24 25 #include "glob.h" 26 #include "oplock.h" 27 #include "connection.h" 28 #include "vfs.h" 29 #include "vfs_cache.h" 30 #include "smbacl.h" 31 #include "ndr.h" 32 #include "auth.h" 33 #include "misc.h" 34 #include "stats.h" 35 36 #include "smb_common.h" 37 #include "mgmt/share_config.h" 38 #include "mgmt/tree_connect.h" 39 #include "mgmt/user_session.h" 40 #include "mgmt/user_config.h" 41 42 static void ksmbd_vfs_inherit_owner(struct ksmbd_work *work, 43 struct inode *parent_inode, 44 struct inode *inode) 45 { 46 if (!test_share_config_flag(work->tcon->share_conf, 47 KSMBD_SHARE_FLAG_INHERIT_OWNER)) 48 return; 49 50 i_uid_write(inode, i_uid_read(parent_inode)); 51 } 52 53 static int ksmbd_vfs_path_lookup(struct ksmbd_share_config *share_conf, 54 char *pathname, unsigned int flags, 55 struct path *path, bool for_remove) 56 { 57 struct qstr last; 58 const struct path *root_share_path = &share_conf->vfs_path; 59 int err; 60 struct dentry *d; 61 62 if (pathname[0] == '\0') { 63 pathname = share_conf->path; 64 root_share_path = NULL; 65 } else { 66 flags |= LOOKUP_BENEATH; 67 } 68 69 CLASS(filename_kernel, filename)(pathname); 70 err = vfs_path_parent_lookup(filename, flags, path, &last, 71 root_share_path); 72 if (err) 73 return err; 74 75 if (for_remove) { 76 err = mnt_want_write(path->mnt); 77 if (err) { 78 path_put(path); 79 return -ENOENT; 80 } 81 82 d = start_removing_noperm(path->dentry, &last); 83 84 if (!IS_ERR(d)) { 85 dput(path->dentry); 86 path->dentry = d; 87 return 0; 88 } 89 mnt_drop_write(path->mnt); 90 path_put(path); 91 return -ENOENT; 92 } 93 94 d = lookup_noperm_unlocked(&last, path->dentry); 95 if (!IS_ERR(d) && d_is_negative(d)) { 96 dput(d); 97 d = ERR_PTR(-ENOENT); 98 } 99 if (IS_ERR(d)) { 100 path_put(path); 101 return -ENOENT; 102 } 103 dput(path->dentry); 104 path->dentry = d; 105 106 if (test_share_config_flag(share_conf, KSMBD_SHARE_FLAG_CROSSMNT)) { 107 err = follow_down(path, 0); 108 if (err < 0) { 109 path_put(path); 110 return -ENOENT; 111 } 112 } 113 return 0; 114 } 115 116 void ksmbd_vfs_query_maximal_access(struct mnt_idmap *idmap, 117 struct dentry *dentry, __le32 *daccess) 118 { 119 *daccess = cpu_to_le32(FILE_READ_ATTRIBUTES | READ_CONTROL); 120 121 if (!inode_permission(idmap, d_inode(dentry), MAY_OPEN | MAY_WRITE)) 122 *daccess |= cpu_to_le32(WRITE_DAC | WRITE_OWNER | SYNCHRONIZE | 123 FILE_WRITE_DATA | FILE_APPEND_DATA | 124 FILE_WRITE_EA | FILE_WRITE_ATTRIBUTES | 125 FILE_DELETE_CHILD); 126 127 if (!inode_permission(idmap, d_inode(dentry), MAY_OPEN | MAY_READ)) 128 *daccess |= FILE_READ_DATA_LE | FILE_READ_EA_LE; 129 130 if (!inode_permission(idmap, d_inode(dentry), MAY_OPEN | MAY_EXEC)) 131 *daccess |= FILE_EXECUTE_LE; 132 133 if (!inode_permission(idmap, d_inode(dentry->d_parent), MAY_EXEC | MAY_WRITE)) 134 *daccess |= FILE_DELETE_LE; 135 } 136 137 /** 138 * ksmbd_vfs_create() - vfs helper for smb create file 139 * @work: work 140 * @name: file name that is relative to share 141 * @mode: file create mode 142 * 143 * Return: 0 on success, otherwise error 144 */ 145 int ksmbd_vfs_create(struct ksmbd_work *work, const char *name, umode_t mode) 146 { 147 struct path path; 148 struct dentry *dentry; 149 int err; 150 151 dentry = ksmbd_vfs_kern_path_create(work, name, 152 LOOKUP_NO_SYMLINKS, &path); 153 if (IS_ERR(dentry)) { 154 err = PTR_ERR(dentry); 155 if (err != -ENOENT) 156 pr_err("path create failed for %s, err %d\n", 157 name, err); 158 return err; 159 } 160 161 mode |= S_IFREG; 162 err = vfs_create(mnt_idmap(path.mnt), dentry, mode, NULL); 163 if (!err) { 164 ksmbd_vfs_inherit_owner(work, d_inode(path.dentry), 165 d_inode(dentry)); 166 } else { 167 pr_err("File(%s): creation failed (err:%d)\n", name, err); 168 } 169 170 end_creating_path(&path, dentry); 171 return err; 172 } 173 174 /** 175 * ksmbd_vfs_mkdir() - vfs helper for smb create directory 176 * @work: work 177 * @name: directory name that is relative to share 178 * @mode: directory create mode 179 * 180 * Return: 0 on success, otherwise error 181 */ 182 int ksmbd_vfs_mkdir(struct ksmbd_work *work, const char *name, umode_t mode) 183 { 184 struct mnt_idmap *idmap; 185 struct path path; 186 struct dentry *dentry, *d; 187 int err = 0; 188 189 dentry = ksmbd_vfs_kern_path_create(work, name, 190 LOOKUP_NO_SYMLINKS | LOOKUP_DIRECTORY, 191 &path); 192 if (IS_ERR(dentry)) { 193 err = PTR_ERR(dentry); 194 if (err != -EEXIST) 195 ksmbd_debug(VFS, "path create failed for %s, err %d\n", 196 name, err); 197 return err; 198 } 199 200 idmap = mnt_idmap(path.mnt); 201 mode |= S_IFDIR; 202 d = dentry; 203 dentry = vfs_mkdir(idmap, d_inode(path.dentry), dentry, mode, NULL); 204 if (IS_ERR(dentry)) 205 err = PTR_ERR(dentry); 206 else if (d_is_negative(dentry)) 207 err = -ENOENT; 208 if (!err && dentry != d) 209 ksmbd_vfs_inherit_owner(work, d_inode(path.dentry), d_inode(dentry)); 210 211 end_creating_path(&path, dentry); 212 if (err) 213 pr_err("mkdir(%s): creation failed (err:%d)\n", name, err); 214 return err; 215 } 216 217 static ssize_t ksmbd_vfs_getcasexattr(struct mnt_idmap *idmap, 218 struct dentry *dentry, char *attr_name, 219 int attr_name_len, char **attr_value) 220 { 221 char *name, *xattr_list = NULL; 222 ssize_t value_len = -ENOENT, xattr_list_len; 223 224 xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list); 225 if (xattr_list_len <= 0) 226 goto out; 227 228 for (name = xattr_list; name - xattr_list < xattr_list_len; 229 name += strlen(name) + 1) { 230 ksmbd_debug(VFS, "%s, len %zd\n", name, strlen(name)); 231 if (strncasecmp(attr_name, name, attr_name_len)) 232 continue; 233 234 value_len = ksmbd_vfs_getxattr(idmap, 235 dentry, 236 name, 237 attr_value); 238 if (value_len < 0) 239 pr_err("failed to get xattr in file\n"); 240 break; 241 } 242 243 out: 244 kvfree(xattr_list); 245 return value_len; 246 } 247 248 static int ksmbd_vfs_stream_read(struct ksmbd_file *fp, char *buf, loff_t *pos, 249 size_t count) 250 { 251 const struct cred *saved_cred; 252 ssize_t v_len; 253 char *stream_buf = NULL; 254 255 ksmbd_debug(VFS, "read stream data pos : %llu, count : %zd\n", 256 *pos, count); 257 258 saved_cred = override_creds(fp->filp->f_cred); 259 v_len = ksmbd_vfs_getcasexattr(file_mnt_idmap(fp->filp), 260 fp->filp->f_path.dentry, 261 fp->stream.name, 262 fp->stream.size, 263 &stream_buf); 264 revert_creds(saved_cred); 265 if ((int)v_len <= 0) 266 return (int)v_len; 267 268 if (v_len <= *pos) { 269 count = -EINVAL; 270 goto free_buf; 271 } 272 273 if (v_len - *pos < count) 274 count = v_len - *pos; 275 fp->stream.pos = v_len; 276 277 memcpy(buf, &stream_buf[*pos], count); 278 279 free_buf: 280 kvfree(stream_buf); 281 return count; 282 } 283 284 /** 285 * check_lock_range() - vfs helper for smb byte range file locking 286 * @filp: the file to apply the lock to 287 * @start: lock start byte offset 288 * @end: lock end byte offset 289 * @type: byte range type read/write 290 * 291 * Return: 0 on success, otherwise error 292 */ 293 static int check_lock_range(struct file *filp, loff_t start, loff_t end, 294 unsigned char type) 295 { 296 struct file_lock *flock; 297 struct file_lock_context *ctx = locks_inode_context(file_inode(filp)); 298 int error = 0; 299 300 if (start == end) 301 return 0; 302 303 if (!ctx || list_empty_careful(&ctx->flc_posix)) 304 return 0; 305 306 spin_lock(&ctx->flc_lock); 307 for_each_file_lock(flock, &ctx->flc_posix) { 308 /* check conflict locks */ 309 if (flock->fl_end >= start && end >= flock->fl_start) { 310 if (lock_is_read(flock)) { 311 if (type == WRITE) { 312 pr_err("not allow write by shared lock\n"); 313 error = 1; 314 goto out; 315 } 316 } else if (lock_is_write(flock)) { 317 /* check owner in lock */ 318 if (flock->c.flc_file != filp) { 319 error = 1; 320 pr_err("not allow rw access by exclusive lock from other opens\n"); 321 goto out; 322 } 323 } 324 } 325 } 326 out: 327 spin_unlock(&ctx->flc_lock); 328 return error; 329 } 330 331 /** 332 * ksmbd_vfs_read() - vfs helper for smb file read 333 * @work: smb work 334 * @fp: ksmbd file pointer 335 * @count: read byte count 336 * @pos: file pos 337 * @rbuf: read data buffer 338 * 339 * Return: number of read bytes on success, otherwise error 340 */ 341 int ksmbd_vfs_read(struct ksmbd_work *work, struct ksmbd_file *fp, size_t count, 342 loff_t *pos, char *rbuf) 343 { 344 struct file *filp = fp->filp; 345 ssize_t nbytes = 0; 346 struct inode *inode = file_inode(filp); 347 348 if (S_ISDIR(inode->i_mode)) 349 return -EISDIR; 350 351 if (unlikely(count == 0)) 352 return 0; 353 354 if (work->conn->connection_type) { 355 if (!(fp->daccess & (FILE_READ_DATA_LE | FILE_EXECUTE_LE))) { 356 pr_err("no right to read(%pD)\n", fp->filp); 357 return -EACCES; 358 } 359 } 360 361 if (ksmbd_stream_fd(fp)) 362 return ksmbd_vfs_stream_read(fp, rbuf, pos, count); 363 364 if (!work->tcon->posix_extensions) { 365 int ret; 366 367 ret = check_lock_range(filp, *pos, *pos + count - 1, READ); 368 if (ret) { 369 pr_err("unable to read due to lock\n"); 370 return -EAGAIN; 371 } 372 } 373 374 nbytes = kernel_read(filp, rbuf, count, pos); 375 if (nbytes < 0) { 376 pr_err("smb read failed, err = %zd\n", nbytes); 377 return nbytes; 378 } 379 380 filp->f_pos = *pos; 381 ksmbd_counter_add(KSMBD_COUNTER_READ_BYTES, (s64)nbytes); 382 return nbytes; 383 } 384 385 static int ksmbd_vfs_stream_write(struct ksmbd_file *fp, char *buf, loff_t *pos, 386 size_t count) 387 { 388 const struct cred *saved_cred; 389 char *stream_buf = NULL, *wbuf; 390 struct mnt_idmap *idmap = file_mnt_idmap(fp->filp); 391 size_t size; 392 ssize_t v_len; 393 int err = 0; 394 395 ksmbd_debug(VFS, "write stream data pos : %llu, count : %zd\n", 396 *pos, count); 397 398 if (*pos >= XATTR_SIZE_MAX) { 399 pr_err("stream write position %lld is out of bounds\n", *pos); 400 return -EINVAL; 401 } 402 403 size = *pos + count; 404 if (size > XATTR_SIZE_MAX) { 405 size = XATTR_SIZE_MAX; 406 count = XATTR_SIZE_MAX - *pos; 407 } 408 409 saved_cred = override_creds(fp->filp->f_cred); 410 v_len = ksmbd_vfs_getcasexattr(idmap, 411 fp->filp->f_path.dentry, 412 fp->stream.name, 413 fp->stream.size, 414 &stream_buf); 415 if (v_len < 0) { 416 pr_err("not found stream in xattr : %zd\n", v_len); 417 err = v_len; 418 goto out_revert; 419 } 420 421 if (v_len < size) { 422 wbuf = kvzalloc(size, KSMBD_DEFAULT_GFP); 423 if (!wbuf) { 424 err = -ENOMEM; 425 goto out_revert; 426 } 427 428 if (v_len > 0) 429 memcpy(wbuf, stream_buf, v_len); 430 kvfree(stream_buf); 431 stream_buf = wbuf; 432 } 433 434 memcpy(&stream_buf[*pos], buf, count); 435 436 err = ksmbd_vfs_setxattr(idmap, 437 &fp->filp->f_path, 438 fp->stream.name, 439 (void *)stream_buf, 440 size, 441 0, 442 true); 443 out_revert: 444 revert_creds(saved_cred); 445 if (err < 0) 446 goto out; 447 else 448 fp->stream.pos = size; 449 err = 0; 450 out: 451 kvfree(stream_buf); 452 return err; 453 } 454 455 /** 456 * ksmbd_vfs_write() - vfs helper for smb file write 457 * @work: work 458 * @fp: ksmbd file pointer 459 * @buf: buf containing data for writing 460 * @count: read byte count 461 * @pos: file pos 462 * @sync: fsync after write 463 * @written: number of bytes written 464 * 465 * Return: 0 on success, otherwise error 466 */ 467 int ksmbd_vfs_write(struct ksmbd_work *work, struct ksmbd_file *fp, 468 char *buf, size_t count, loff_t *pos, bool sync, 469 ssize_t *written) 470 { 471 struct file *filp; 472 loff_t offset = *pos; 473 int err = 0; 474 475 if (work->conn->connection_type) { 476 if (!(fp->daccess & (FILE_WRITE_DATA_LE | FILE_APPEND_DATA_LE)) || 477 S_ISDIR(file_inode(fp->filp)->i_mode)) { 478 pr_err("no right to write(%pD)\n", fp->filp); 479 err = -EACCES; 480 goto out; 481 } 482 } 483 484 filp = fp->filp; 485 486 if (ksmbd_stream_fd(fp)) { 487 err = ksmbd_vfs_stream_write(fp, buf, pos, count); 488 if (!err) 489 *written = count; 490 goto out; 491 } 492 493 if (!work->tcon->posix_extensions) { 494 err = check_lock_range(filp, *pos, *pos + count - 1, WRITE); 495 if (err) { 496 pr_err("unable to write due to lock\n"); 497 err = -EAGAIN; 498 goto out; 499 } 500 } 501 502 /* Reserve lease break for parent dir at closing time */ 503 fp->reserve_lease_break = true; 504 505 /* Do we need to break any of a levelII oplock? */ 506 smb_break_all_levII_oplock(work, fp, 1); 507 508 err = kernel_write(filp, buf, count, pos); 509 if (err < 0) { 510 ksmbd_debug(VFS, "smb write failed, err = %d\n", err); 511 goto out; 512 } 513 514 filp->f_pos = *pos; 515 *written = err; 516 err = 0; 517 if (sync) { 518 err = vfs_fsync_range(filp, offset, offset + *written, 0); 519 if (err < 0) 520 pr_err("fsync failed for filename = %pD, err = %d\n", 521 fp->filp, err); 522 } 523 ksmbd_counter_add(KSMBD_COUNTER_WRITE_BYTES, (s64)*written); 524 525 out: 526 return err; 527 } 528 529 /** 530 * ksmbd_vfs_getattr() - vfs helper for smb getattr 531 * @path: path of dentry 532 * @stat: pointer to returned kernel stat structure 533 * Return: 0 on success, otherwise error 534 */ 535 int ksmbd_vfs_getattr(const struct path *path, struct kstat *stat) 536 { 537 int err; 538 539 err = vfs_getattr(path, stat, STATX_BASIC_STATS | STATX_BTIME, 540 AT_STATX_SYNC_AS_STAT); 541 if (err) 542 pr_err("getattr failed, err %d\n", err); 543 return err; 544 } 545 546 /** 547 * ksmbd_vfs_fsync() - vfs helper for smb fsync 548 * @work: work 549 * @fid: file id of open file 550 * @p_id: persistent file id 551 * 552 * Return: 0 on success, otherwise error 553 */ 554 int ksmbd_vfs_fsync(struct ksmbd_work *work, u64 fid, u64 p_id) 555 { 556 struct ksmbd_file *fp; 557 int err; 558 559 fp = ksmbd_lookup_fd_slow(work, fid, p_id); 560 if (!fp) { 561 pr_err("failed to get filp for fid %llu\n", fid); 562 return -ENOENT; 563 } 564 err = vfs_fsync(fp->filp, 0); 565 if (err < 0) 566 pr_err("smb fsync failed, err = %d\n", err); 567 ksmbd_fd_put(work, fp); 568 return err; 569 } 570 571 /** 572 * ksmbd_vfs_remove_file() - vfs helper for smb rmdir or unlink 573 * @work: work 574 * @path: path of dentry 575 * 576 * Return: 0 on success, otherwise error 577 */ 578 int ksmbd_vfs_remove_file(struct ksmbd_work *work, const struct path *path) 579 { 580 struct mnt_idmap *idmap; 581 struct dentry *parent = path->dentry->d_parent; 582 int err; 583 584 if (ksmbd_override_fsids(work)) 585 return -ENOMEM; 586 587 if (!d_inode(path->dentry)->i_nlink) { 588 err = -ENOENT; 589 goto out_err; 590 } 591 592 idmap = mnt_idmap(path->mnt); 593 if (S_ISDIR(d_inode(path->dentry)->i_mode)) { 594 err = vfs_rmdir(idmap, d_inode(parent), path->dentry, NULL); 595 if (err && err != -ENOTEMPTY) 596 ksmbd_debug(VFS, "rmdir failed, err %d\n", err); 597 } else { 598 err = vfs_unlink(idmap, d_inode(parent), path->dentry, NULL); 599 if (err) 600 ksmbd_debug(VFS, "unlink failed, err %d\n", err); 601 } 602 603 out_err: 604 ksmbd_revert_fsids(work); 605 return err; 606 } 607 608 /** 609 * ksmbd_vfs_link() - vfs helper for creating smb hardlink 610 * @work: work 611 * @oldname: source file name 612 * @newname: hardlink name that is relative to share 613 * 614 * Return: 0 on success, otherwise error 615 */ 616 int ksmbd_vfs_link(struct ksmbd_work *work, const char *oldname, 617 const char *newname) 618 { 619 struct path oldpath, newpath; 620 struct dentry *dentry; 621 int err; 622 623 if (ksmbd_override_fsids(work)) 624 return -ENOMEM; 625 626 err = kern_path(oldname, LOOKUP_NO_SYMLINKS, &oldpath); 627 if (err) { 628 pr_err("cannot get linux path for %s, err = %d\n", 629 oldname, err); 630 goto out1; 631 } 632 633 dentry = ksmbd_vfs_kern_path_create(work, newname, 634 LOOKUP_NO_SYMLINKS | LOOKUP_REVAL, 635 &newpath); 636 if (IS_ERR(dentry)) { 637 err = PTR_ERR(dentry); 638 pr_err("path create err for %s, err %d\n", newname, err); 639 goto out2; 640 } 641 642 err = -EXDEV; 643 if (oldpath.mnt != newpath.mnt) { 644 pr_err("vfs_link failed err %d\n", err); 645 goto out3; 646 } 647 648 err = vfs_link(oldpath.dentry, mnt_idmap(newpath.mnt), 649 d_inode(newpath.dentry), 650 dentry, NULL); 651 if (err) 652 ksmbd_debug(VFS, "vfs_link failed err %d\n", err); 653 654 out3: 655 end_creating_path(&newpath, dentry); 656 out2: 657 path_put(&oldpath); 658 out1: 659 ksmbd_revert_fsids(work); 660 return err; 661 } 662 663 int ksmbd_vfs_rename(struct ksmbd_work *work, const struct path *old_path, 664 char *newname, int flags) 665 { 666 struct dentry *old_child = old_path->dentry; 667 struct path new_path; 668 struct qstr new_last; 669 struct renamedata rd; 670 struct ksmbd_share_config *share_conf = work->tcon->share_conf; 671 struct ksmbd_file *parent_fp; 672 int err, lookup_flags = LOOKUP_NO_SYMLINKS; 673 674 if (ksmbd_override_fsids(work)) 675 return -ENOMEM; 676 677 CLASS(filename_kernel, to)(newname); 678 679 retry: 680 err = vfs_path_parent_lookup(to, lookup_flags | LOOKUP_BENEATH, 681 &new_path, &new_last, &share_conf->vfs_path); 682 if (err) 683 goto out1; 684 685 if (old_path->mnt != new_path.mnt) { 686 err = -EXDEV; 687 goto out2; 688 } 689 690 err = mnt_want_write(old_path->mnt); 691 if (err) 692 goto out2; 693 694 rd.mnt_idmap = mnt_idmap(old_path->mnt); 695 rd.old_parent = NULL; 696 rd.new_parent = new_path.dentry; 697 rd.flags = flags; 698 rd.delegated_inode = NULL; 699 err = start_renaming_dentry(&rd, lookup_flags, old_child, &new_last); 700 if (err) 701 goto out_drop_write; 702 703 parent_fp = ksmbd_lookup_fd_inode(old_child->d_parent); 704 if (parent_fp) { 705 if (parent_fp->daccess & FILE_DELETE_LE) { 706 pr_err("parent dir is opened with delete access\n"); 707 err = -ESHARE; 708 ksmbd_fd_put(work, parent_fp); 709 goto out3; 710 } 711 ksmbd_fd_put(work, parent_fp); 712 } 713 714 if (d_is_symlink(rd.new_dentry)) { 715 err = -EACCES; 716 goto out3; 717 } 718 719 err = vfs_rename(&rd); 720 if (err) 721 ksmbd_debug(VFS, "vfs_rename failed err %d\n", err); 722 723 out3: 724 end_renaming(&rd); 725 out_drop_write: 726 mnt_drop_write(old_path->mnt); 727 out2: 728 path_put(&new_path); 729 730 if (retry_estale(err, lookup_flags)) { 731 lookup_flags |= LOOKUP_REVAL; 732 goto retry; 733 } 734 out1: 735 ksmbd_revert_fsids(work); 736 return err; 737 } 738 739 /** 740 * ksmbd_vfs_truncate() - vfs helper for smb file truncate 741 * @work: work 742 * @fp: ksmbd file pointer 743 * @size: truncate to given size 744 * 745 * Return: 0 on success, otherwise error 746 */ 747 int ksmbd_vfs_truncate(struct ksmbd_work *work, 748 struct ksmbd_file *fp, loff_t size) 749 { 750 int err = 0; 751 struct file *filp; 752 753 filp = fp->filp; 754 755 /* Do we need to break any of a levelII oplock? */ 756 smb_break_all_levII_oplock(work, fp, 1); 757 758 if (!work->tcon->posix_extensions) { 759 struct inode *inode = file_inode(filp); 760 761 if (size < inode->i_size) { 762 err = check_lock_range(filp, size, 763 inode->i_size - 1, WRITE); 764 } else if (size > inode->i_size) { 765 err = check_lock_range(filp, inode->i_size, 766 size - 1, WRITE); 767 } 768 769 if (err) { 770 pr_err("failed due to lock\n"); 771 return -EAGAIN; 772 } 773 } 774 775 err = vfs_truncate(&filp->f_path, size); 776 if (err) 777 pr_err("truncate failed, err %d\n", err); 778 return err; 779 } 780 781 /** 782 * ksmbd_vfs_listxattr() - vfs helper for smb list extended attributes 783 * @dentry: dentry of file for listing xattrs 784 * @list: destination buffer 785 * 786 * Return: xattr list length on success, otherwise error 787 */ 788 ssize_t ksmbd_vfs_listxattr(struct dentry *dentry, char **list) 789 { 790 ssize_t size; 791 char *vlist = NULL; 792 793 size = vfs_listxattr(dentry, NULL, 0); 794 if (size <= 0) 795 return size; 796 797 vlist = kvzalloc(size, KSMBD_DEFAULT_GFP); 798 if (!vlist) 799 return -ENOMEM; 800 801 *list = vlist; 802 size = vfs_listxattr(dentry, vlist, size); 803 if (size < 0) { 804 ksmbd_debug(VFS, "listxattr failed\n"); 805 kvfree(vlist); 806 *list = NULL; 807 } 808 809 return size; 810 } 811 812 static ssize_t ksmbd_vfs_xattr_len(struct mnt_idmap *idmap, 813 struct dentry *dentry, char *xattr_name) 814 { 815 return vfs_getxattr(idmap, dentry, xattr_name, NULL, 0); 816 } 817 818 /** 819 * ksmbd_vfs_getxattr() - vfs helper for smb get extended attributes value 820 * @idmap: idmap 821 * @dentry: dentry of file for getting xattrs 822 * @xattr_name: name of xattr name to query 823 * @xattr_buf: destination buffer xattr value 824 * 825 * Return: read xattr value length on success, otherwise error 826 */ 827 ssize_t ksmbd_vfs_getxattr(struct mnt_idmap *idmap, 828 struct dentry *dentry, 829 char *xattr_name, char **xattr_buf) 830 { 831 ssize_t xattr_len; 832 char *buf; 833 834 *xattr_buf = NULL; 835 xattr_len = ksmbd_vfs_xattr_len(idmap, dentry, xattr_name); 836 if (xattr_len < 0) 837 return xattr_len; 838 839 buf = kmalloc(xattr_len + 1, KSMBD_DEFAULT_GFP); 840 if (!buf) 841 return -ENOMEM; 842 843 xattr_len = vfs_getxattr(idmap, dentry, xattr_name, 844 (void *)buf, xattr_len); 845 if (xattr_len > 0) 846 *xattr_buf = buf; 847 else 848 kfree(buf); 849 return xattr_len; 850 } 851 852 /** 853 * ksmbd_vfs_setxattr() - vfs helper for smb set extended attributes value 854 * @idmap: idmap of the relevant mount 855 * @path: path of dentry to set XATTR at 856 * @attr_name: xattr name for setxattr 857 * @attr_value: xattr value to set 858 * @attr_size: size of xattr value 859 * @flags: destination buffer length 860 * @get_write: get write access to a mount 861 * 862 * Return: 0 on success, otherwise error 863 */ 864 int ksmbd_vfs_setxattr(struct mnt_idmap *idmap, 865 const struct path *path, const char *attr_name, 866 void *attr_value, size_t attr_size, int flags, 867 bool get_write) 868 { 869 int err; 870 871 if (get_write == true) { 872 err = mnt_want_write(path->mnt); 873 if (err) 874 return err; 875 } 876 877 err = vfs_setxattr(idmap, 878 path->dentry, 879 attr_name, 880 attr_value, 881 attr_size, 882 flags); 883 if (err) 884 ksmbd_debug(VFS, "setxattr failed, err %d\n", err); 885 if (get_write == true) 886 mnt_drop_write(path->mnt); 887 return err; 888 } 889 890 /** 891 * ksmbd_vfs_set_fadvise() - convert smb IO caching options to linux options 892 * @filp: file pointer for IO 893 * @option: smb IO options 894 */ 895 void ksmbd_vfs_set_fadvise(struct file *filp, __le32 option) 896 { 897 struct address_space *mapping; 898 899 mapping = filp->f_mapping; 900 901 if (!option || !mapping) 902 return; 903 904 if (option & FILE_WRITE_THROUGH_LE) { 905 filp->f_flags |= O_SYNC; 906 } else if (option & FILE_SEQUENTIAL_ONLY_LE) { 907 filp->f_ra.ra_pages = inode_to_bdi(mapping->host)->ra_pages * 2; 908 spin_lock(&filp->f_lock); 909 filp->f_mode &= ~FMODE_RANDOM; 910 spin_unlock(&filp->f_lock); 911 } else if (option & FILE_RANDOM_ACCESS_LE) { 912 spin_lock(&filp->f_lock); 913 filp->f_mode |= FMODE_RANDOM; 914 spin_unlock(&filp->f_lock); 915 } 916 } 917 918 int ksmbd_vfs_zero_data(struct ksmbd_work *work, struct ksmbd_file *fp, 919 loff_t off, loff_t len) 920 { 921 const struct cred *saved_cred; 922 int err; 923 924 smb_break_all_levII_oplock(work, fp, 1); 925 saved_cred = override_creds(fp->filp->f_cred); 926 if (fp->f_ci->m_fattr & FILE_ATTRIBUTE_SPARSE_FILE_LE) 927 err = vfs_fallocate(fp->filp, 928 FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, 929 off, len); 930 else 931 err = vfs_fallocate(fp->filp, 932 FALLOC_FL_ZERO_RANGE | FALLOC_FL_KEEP_SIZE, 933 off, len); 934 revert_creds(saved_cred); 935 return err; 936 } 937 938 int ksmbd_vfs_fqar_lseek(struct ksmbd_file *fp, loff_t start, loff_t length, 939 struct file_allocated_range_buffer *ranges, 940 unsigned int in_count, unsigned int *out_count) 941 { 942 struct file *f = fp->filp; 943 struct inode *inode = file_inode(fp->filp); 944 loff_t maxbytes = (u64)inode->i_sb->s_maxbytes, end; 945 loff_t extent_start, extent_end; 946 int ret = 0; 947 948 if (start > maxbytes) 949 return -EFBIG; 950 951 if (!in_count) 952 return 0; 953 954 /* 955 * Shrink request scope to what the fs can actually handle. 956 */ 957 if (length > maxbytes || (maxbytes - length) < start) 958 length = maxbytes - start; 959 960 if (start + length > inode->i_size) 961 length = inode->i_size - start; 962 963 *out_count = 0; 964 end = start + length; 965 while (start < end && *out_count < in_count) { 966 extent_start = vfs_llseek(f, start, SEEK_DATA); 967 if (extent_start < 0) { 968 if (extent_start != -ENXIO) 969 ret = (int)extent_start; 970 break; 971 } 972 973 if (extent_start >= end) 974 break; 975 976 extent_end = vfs_llseek(f, extent_start, SEEK_HOLE); 977 if (extent_end < 0) { 978 if (extent_end != -ENXIO) 979 ret = (int)extent_end; 980 break; 981 } else if (extent_start >= extent_end) { 982 break; 983 } 984 985 ranges[*out_count].file_offset = cpu_to_le64(extent_start); 986 ranges[(*out_count)++].length = 987 cpu_to_le64(min(extent_end, end) - extent_start); 988 989 start = extent_end; 990 } 991 992 return ret; 993 } 994 995 int ksmbd_vfs_remove_xattr(struct mnt_idmap *idmap, 996 const struct path *path, char *attr_name, 997 bool get_write) 998 { 999 int err; 1000 1001 if (get_write == true) { 1002 err = mnt_want_write(path->mnt); 1003 if (err) 1004 return err; 1005 } 1006 1007 err = vfs_removexattr(idmap, path->dentry, attr_name); 1008 1009 if (get_write == true) 1010 mnt_drop_write(path->mnt); 1011 1012 return err; 1013 } 1014 1015 int ksmbd_vfs_unlink(struct file *filp) 1016 { 1017 const struct cred *saved_cred; 1018 int err = 0; 1019 struct dentry *dir, *dentry = filp->f_path.dentry; 1020 struct mnt_idmap *idmap = file_mnt_idmap(filp); 1021 1022 saved_cred = override_creds(filp->f_cred); 1023 err = mnt_want_write(filp->f_path.mnt); 1024 if (err) 1025 goto out_revert; 1026 1027 dir = dget_parent(dentry); 1028 dentry = start_removing_dentry(dir, dentry); 1029 err = PTR_ERR(dentry); 1030 if (IS_ERR(dentry)) 1031 goto out; 1032 1033 if (S_ISDIR(d_inode(dentry)->i_mode)) 1034 err = vfs_rmdir(idmap, d_inode(dir), dentry, NULL); 1035 else 1036 err = vfs_unlink(idmap, d_inode(dir), dentry, NULL); 1037 1038 end_removing(dentry); 1039 if (err) 1040 ksmbd_debug(VFS, "failed to delete, err %d\n", err); 1041 out: 1042 dput(dir); 1043 mnt_drop_write(filp->f_path.mnt); 1044 out_revert: 1045 revert_creds(saved_cred); 1046 return err; 1047 } 1048 1049 static bool __dir_empty(struct dir_context *ctx, const char *name, int namlen, 1050 loff_t offset, u64 ino, unsigned int d_type) 1051 { 1052 struct ksmbd_readdir_data *buf; 1053 1054 buf = container_of(ctx, struct ksmbd_readdir_data, ctx); 1055 if (!name_is_dot_dotdot(name, namlen)) 1056 buf->dirent_count++; 1057 1058 return !buf->dirent_count; 1059 } 1060 1061 /** 1062 * ksmbd_vfs_empty_dir() - check for empty directory 1063 * @fp: ksmbd file pointer 1064 * 1065 * Return: true if directory empty, otherwise false 1066 */ 1067 int ksmbd_vfs_empty_dir(struct ksmbd_file *fp) 1068 { 1069 int err; 1070 struct ksmbd_readdir_data readdir_data; 1071 1072 memset(&readdir_data, 0, sizeof(struct ksmbd_readdir_data)); 1073 1074 set_ctx_actor(&readdir_data.ctx, __dir_empty); 1075 readdir_data.dirent_count = 0; 1076 1077 err = iterate_dir(fp->filp, &readdir_data.ctx); 1078 if (readdir_data.dirent_count) 1079 err = -ENOTEMPTY; 1080 else 1081 err = 0; 1082 return err; 1083 } 1084 1085 static bool __caseless_lookup(struct dir_context *ctx, const char *name, 1086 int namlen, loff_t offset, u64 ino, 1087 unsigned int d_type) 1088 { 1089 struct ksmbd_readdir_data *buf; 1090 int cmp = -EINVAL; 1091 1092 buf = container_of(ctx, struct ksmbd_readdir_data, ctx); 1093 1094 if (buf->used != namlen) 1095 return true; 1096 if (IS_ENABLED(CONFIG_UNICODE) && buf->um) { 1097 const struct qstr q_buf = {.name = buf->private, 1098 .len = buf->used}; 1099 const struct qstr q_name = {.name = name, 1100 .len = namlen}; 1101 1102 cmp = utf8_strncasecmp(buf->um, &q_buf, &q_name); 1103 } 1104 if (cmp < 0) 1105 cmp = strncasecmp((char *)buf->private, name, namlen); 1106 if (!cmp) { 1107 memcpy((char *)buf->private, name, buf->used); 1108 buf->dirent_count = 1; 1109 return false; 1110 } 1111 return true; 1112 } 1113 1114 /** 1115 * ksmbd_vfs_lookup_in_dir() - lookup a file in a directory 1116 * @dir: path info 1117 * @name: filename to lookup 1118 * @namelen: filename length 1119 * @um: &struct unicode_map to use 1120 * 1121 * Return: 0 on success, otherwise error 1122 */ 1123 static int ksmbd_vfs_lookup_in_dir(const struct path *dir, char *name, 1124 size_t namelen, struct unicode_map *um) 1125 { 1126 int ret; 1127 struct file *dfilp; 1128 int flags = O_RDONLY | O_LARGEFILE; 1129 struct ksmbd_readdir_data readdir_data = { 1130 .ctx.actor = __caseless_lookup, 1131 .private = name, 1132 .used = namelen, 1133 .dirent_count = 0, 1134 .um = um, 1135 }; 1136 1137 dfilp = dentry_open(dir, flags, current_cred()); 1138 if (IS_ERR(dfilp)) 1139 return PTR_ERR(dfilp); 1140 1141 ret = iterate_dir(dfilp, &readdir_data.ctx); 1142 if (readdir_data.dirent_count > 0) 1143 ret = 0; 1144 fput(dfilp); 1145 return ret; 1146 } 1147 1148 static 1149 int __ksmbd_vfs_kern_path(struct ksmbd_work *work, char *filepath, 1150 unsigned int flags, 1151 struct path *path, bool caseless, bool for_remove) 1152 { 1153 struct ksmbd_share_config *share_conf = work->tcon->share_conf; 1154 struct path parent_path; 1155 size_t path_len, remain_len; 1156 int err; 1157 1158 retry: 1159 err = ksmbd_vfs_path_lookup(share_conf, filepath, flags, path, for_remove); 1160 if (!err || err != -ENOENT || !caseless) 1161 return err; 1162 1163 path_len = strlen(filepath); 1164 remain_len = path_len; 1165 1166 parent_path = share_conf->vfs_path; 1167 path_get(&parent_path); 1168 1169 while (d_can_lookup(parent_path.dentry)) { 1170 char *filename = filepath + path_len - remain_len; 1171 char *next = strchrnul(filename, '/'); 1172 size_t filename_len = next - filename; 1173 bool is_last = !next[0]; 1174 1175 if (filename_len == 0) 1176 break; 1177 1178 err = ksmbd_vfs_lookup_in_dir(&parent_path, filename, 1179 filename_len, 1180 work->conn->um); 1181 path_put(&parent_path); 1182 if (err) 1183 goto out; 1184 if (is_last) { 1185 caseless = false; 1186 goto retry; 1187 } 1188 next[0] = '\0'; 1189 1190 err = vfs_path_lookup(share_conf->vfs_path.dentry, 1191 share_conf->vfs_path.mnt, 1192 filepath, 1193 flags, 1194 &parent_path); 1195 next[0] = '/'; 1196 if (err) 1197 goto out; 1198 1199 remain_len -= filename_len + 1; 1200 } 1201 1202 err = -EINVAL; 1203 path_put(&parent_path); 1204 out: 1205 return err; 1206 } 1207 1208 /** 1209 * ksmbd_vfs_kern_path() - lookup a file and get path info 1210 * @work: work 1211 * @filepath: file path that is relative to share 1212 * @flags: lookup flags 1213 * @path: if lookup succeed, return path info 1214 * @caseless: caseless filename lookup 1215 * 1216 * Perform the lookup, possibly crossing over any mount point. 1217 * On return no locks will be held and write-access to filesystem 1218 * won't have been checked. 1219 * Return: 0 if file was found, otherwise error 1220 */ 1221 int ksmbd_vfs_kern_path(struct ksmbd_work *work, char *filepath, 1222 unsigned int flags, 1223 struct path *path, bool caseless) 1224 { 1225 return __ksmbd_vfs_kern_path(work, filepath, flags, path, 1226 caseless, false); 1227 } 1228 1229 /** 1230 * ksmbd_vfs_kern_path_start_removing() - lookup a file and get path info prior to removal 1231 * @work: work 1232 * @filepath: file path that is relative to share 1233 * @flags: lookup flags 1234 * @path: if lookup succeed, return path info 1235 * @caseless: caseless filename lookup 1236 * 1237 * Perform the lookup, but don't cross over any mount point. 1238 * On return the parent of path->dentry will be locked and write-access to 1239 * filesystem will have been gained. 1240 * Return: 0 on if file was found, otherwise error 1241 */ 1242 int ksmbd_vfs_kern_path_start_removing(struct ksmbd_work *work, char *filepath, 1243 unsigned int flags, 1244 struct path *path, bool caseless) 1245 { 1246 return __ksmbd_vfs_kern_path(work, filepath, flags, path, 1247 caseless, true); 1248 } 1249 1250 void ksmbd_vfs_kern_path_end_removing(const struct path *path) 1251 { 1252 end_removing(path->dentry); 1253 mnt_drop_write(path->mnt); 1254 mntput(path->mnt); 1255 } 1256 1257 struct dentry *ksmbd_vfs_kern_path_create(struct ksmbd_work *work, 1258 const char *name, 1259 unsigned int flags, 1260 struct path *path) 1261 { 1262 struct ksmbd_share_config *share_conf = work->tcon->share_conf; 1263 struct qstr last; 1264 struct dentry *dent; 1265 int err; 1266 1267 /* resolve the name beneath the share root so ".." cannot escape */ 1268 CLASS(filename_kernel, filename)(name); 1269 1270 err = vfs_path_parent_lookup(filename, flags | LOOKUP_BENEATH, 1271 path, &last, &share_conf->vfs_path); 1272 if (err) 1273 return ERR_PTR(err); 1274 1275 err = mnt_want_write(path->mnt); 1276 if (err) { 1277 path_put(path); 1278 return ERR_PTR(err); 1279 } 1280 1281 dent = start_creating_noperm(path->dentry, &last); 1282 if (IS_ERR(dent)) { 1283 mnt_drop_write(path->mnt); 1284 path_put(path); 1285 } 1286 return dent; 1287 } 1288 1289 int ksmbd_vfs_remove_acl_xattrs(struct mnt_idmap *idmap, 1290 const struct path *path) 1291 { 1292 char *name, *xattr_list = NULL; 1293 ssize_t xattr_list_len; 1294 int err = 0; 1295 1296 xattr_list_len = ksmbd_vfs_listxattr(path->dentry, &xattr_list); 1297 if (xattr_list_len < 0) { 1298 goto out; 1299 } else if (!xattr_list_len) { 1300 ksmbd_debug(SMB, "empty xattr in the file\n"); 1301 goto out; 1302 } 1303 1304 err = mnt_want_write(path->mnt); 1305 if (err) 1306 goto out; 1307 1308 for (name = xattr_list; name - xattr_list < xattr_list_len; 1309 name += strlen(name) + 1) { 1310 ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name)); 1311 1312 if (!strncmp(name, XATTR_NAME_POSIX_ACL_ACCESS, 1313 sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1) || 1314 !strncmp(name, XATTR_NAME_POSIX_ACL_DEFAULT, 1315 sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1)) { 1316 err = vfs_remove_acl(idmap, path->dentry, name); 1317 if (err) 1318 ksmbd_debug(SMB, 1319 "remove acl xattr failed : %s\n", name); 1320 } 1321 } 1322 mnt_drop_write(path->mnt); 1323 1324 out: 1325 kvfree(xattr_list); 1326 return err; 1327 } 1328 1329 int ksmbd_vfs_remove_sd_xattrs(struct mnt_idmap *idmap, const struct path *path) 1330 { 1331 char *name, *xattr_list = NULL; 1332 ssize_t xattr_list_len; 1333 int err = 0; 1334 1335 xattr_list_len = ksmbd_vfs_listxattr(path->dentry, &xattr_list); 1336 if (xattr_list_len < 0) { 1337 goto out; 1338 } else if (!xattr_list_len) { 1339 ksmbd_debug(SMB, "empty xattr in the file\n"); 1340 goto out; 1341 } 1342 1343 for (name = xattr_list; name - xattr_list < xattr_list_len; 1344 name += strlen(name) + 1) { 1345 ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name)); 1346 1347 if (!strncmp(name, XATTR_NAME_SD, XATTR_NAME_SD_LEN)) { 1348 err = ksmbd_vfs_remove_xattr(idmap, path, name, true); 1349 if (err) 1350 ksmbd_debug(SMB, "remove xattr failed : %s\n", name); 1351 } 1352 } 1353 out: 1354 kvfree(xattr_list); 1355 return err; 1356 } 1357 1358 static struct xattr_smb_acl *ksmbd_vfs_make_xattr_posix_acl(struct mnt_idmap *idmap, 1359 struct inode *inode, 1360 int acl_type) 1361 { 1362 struct xattr_smb_acl *smb_acl = NULL; 1363 struct posix_acl *posix_acls; 1364 struct posix_acl_entry *pa_entry; 1365 struct xattr_acl_entry *xa_entry; 1366 int i; 1367 1368 if (!IS_ENABLED(CONFIG_FS_POSIX_ACL)) 1369 return NULL; 1370 1371 posix_acls = get_inode_acl(inode, acl_type); 1372 if (IS_ERR_OR_NULL(posix_acls)) 1373 return NULL; 1374 1375 smb_acl = kzalloc(sizeof(struct xattr_smb_acl) + 1376 sizeof(struct xattr_acl_entry) * posix_acls->a_count, 1377 KSMBD_DEFAULT_GFP); 1378 if (!smb_acl) 1379 goto out; 1380 1381 smb_acl->count = posix_acls->a_count; 1382 pa_entry = posix_acls->a_entries; 1383 xa_entry = smb_acl->entries; 1384 for (i = 0; i < posix_acls->a_count; i++, pa_entry++, xa_entry++) { 1385 switch (pa_entry->e_tag) { 1386 case ACL_USER: 1387 xa_entry->type = SMB_ACL_USER; 1388 xa_entry->uid = posix_acl_uid_translate(idmap, pa_entry); 1389 break; 1390 case ACL_USER_OBJ: 1391 xa_entry->type = SMB_ACL_USER_OBJ; 1392 break; 1393 case ACL_GROUP: 1394 xa_entry->type = SMB_ACL_GROUP; 1395 xa_entry->gid = posix_acl_gid_translate(idmap, pa_entry); 1396 break; 1397 case ACL_GROUP_OBJ: 1398 xa_entry->type = SMB_ACL_GROUP_OBJ; 1399 break; 1400 case ACL_OTHER: 1401 xa_entry->type = SMB_ACL_OTHER; 1402 break; 1403 case ACL_MASK: 1404 xa_entry->type = SMB_ACL_MASK; 1405 break; 1406 default: 1407 pr_err("unknown type : 0x%x\n", pa_entry->e_tag); 1408 goto out; 1409 } 1410 1411 if (pa_entry->e_perm & ACL_READ) 1412 xa_entry->perm |= SMB_ACL_READ; 1413 if (pa_entry->e_perm & ACL_WRITE) 1414 xa_entry->perm |= SMB_ACL_WRITE; 1415 if (pa_entry->e_perm & ACL_EXECUTE) 1416 xa_entry->perm |= SMB_ACL_EXECUTE; 1417 } 1418 out: 1419 posix_acl_release(posix_acls); 1420 return smb_acl; 1421 } 1422 1423 int ksmbd_vfs_set_sd_xattr(struct ksmbd_conn *conn, 1424 struct mnt_idmap *idmap, 1425 const struct path *path, 1426 struct smb_ntsd *pntsd, int len, 1427 bool get_write) 1428 { 1429 int rc; 1430 struct ndr sd_ndr = {0}, acl_ndr = {0}; 1431 struct xattr_ntacl acl = {0}; 1432 struct xattr_smb_acl *smb_acl, *def_smb_acl = NULL; 1433 struct dentry *dentry = path->dentry; 1434 struct inode *inode = d_inode(dentry); 1435 1436 acl.version = 4; 1437 acl.hash_type = XATTR_SD_HASH_TYPE_SHA256; 1438 acl.current_time = ksmbd_UnixTimeToNT(current_time(inode)); 1439 1440 memcpy(acl.desc, "posix_acl", 9); 1441 acl.desc_len = 10; 1442 1443 pntsd->osidoffset = 1444 cpu_to_le32(le32_to_cpu(pntsd->osidoffset) + NDR_NTSD_OFFSETOF); 1445 pntsd->gsidoffset = 1446 cpu_to_le32(le32_to_cpu(pntsd->gsidoffset) + NDR_NTSD_OFFSETOF); 1447 pntsd->dacloffset = 1448 cpu_to_le32(le32_to_cpu(pntsd->dacloffset) + NDR_NTSD_OFFSETOF); 1449 1450 acl.sd_buf = (char *)pntsd; 1451 acl.sd_size = len; 1452 1453 sha256(acl.sd_buf, acl.sd_size, acl.hash); 1454 1455 smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode, 1456 ACL_TYPE_ACCESS); 1457 if (S_ISDIR(inode->i_mode)) 1458 def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode, 1459 ACL_TYPE_DEFAULT); 1460 1461 rc = ndr_encode_posix_acl(&acl_ndr, idmap, inode, 1462 smb_acl, def_smb_acl); 1463 if (rc) { 1464 pr_err("failed to encode ndr to posix acl\n"); 1465 goto out; 1466 } 1467 1468 sha256(acl_ndr.data, acl_ndr.offset, acl.posix_acl_hash); 1469 1470 rc = ndr_encode_v4_ntacl(&sd_ndr, &acl); 1471 if (rc) { 1472 pr_err("failed to encode ndr to posix acl\n"); 1473 goto out; 1474 } 1475 1476 rc = ksmbd_vfs_setxattr(idmap, path, 1477 XATTR_NAME_SD, sd_ndr.data, 1478 sd_ndr.offset, 0, get_write); 1479 if (rc < 0) 1480 pr_err("Failed to store XATTR ntacl :%d\n", rc); 1481 1482 kfree(sd_ndr.data); 1483 out: 1484 kfree(acl_ndr.data); 1485 kfree(smb_acl); 1486 kfree(def_smb_acl); 1487 return rc; 1488 } 1489 1490 int ksmbd_vfs_get_sd_xattr(struct ksmbd_conn *conn, 1491 struct mnt_idmap *idmap, 1492 struct dentry *dentry, 1493 struct smb_ntsd **pntsd) 1494 { 1495 int rc; 1496 struct ndr n; 1497 struct inode *inode = d_inode(dentry); 1498 struct ndr acl_ndr = {0}; 1499 struct xattr_ntacl acl; 1500 struct xattr_smb_acl *smb_acl = NULL, *def_smb_acl = NULL; 1501 __u8 cmp_hash[XATTR_SD_HASH_SIZE] = {0}; 1502 1503 rc = ksmbd_vfs_getxattr(idmap, dentry, XATTR_NAME_SD, &n.data); 1504 if (rc <= 0) 1505 return rc; 1506 1507 n.length = rc; 1508 rc = ndr_decode_v4_ntacl(&n, &acl); 1509 if (rc) 1510 goto free_n_data; 1511 1512 smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode, 1513 ACL_TYPE_ACCESS); 1514 if (S_ISDIR(inode->i_mode)) 1515 def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode, 1516 ACL_TYPE_DEFAULT); 1517 1518 rc = ndr_encode_posix_acl(&acl_ndr, idmap, inode, smb_acl, 1519 def_smb_acl); 1520 if (rc) { 1521 pr_err("failed to encode ndr to posix acl\n"); 1522 goto out_free; 1523 } 1524 1525 sha256(acl_ndr.data, acl_ndr.offset, cmp_hash); 1526 1527 if (memcmp(cmp_hash, acl.posix_acl_hash, XATTR_SD_HASH_SIZE)) { 1528 pr_err("hash value diff\n"); 1529 rc = -EINVAL; 1530 goto out_free; 1531 } 1532 1533 *pntsd = acl.sd_buf; 1534 if (acl.sd_size < sizeof(struct smb_ntsd)) { 1535 pr_err("sd size is invalid\n"); 1536 goto out_free; 1537 } 1538 1539 (*pntsd)->osidoffset = cpu_to_le32(le32_to_cpu((*pntsd)->osidoffset) - 1540 NDR_NTSD_OFFSETOF); 1541 (*pntsd)->gsidoffset = cpu_to_le32(le32_to_cpu((*pntsd)->gsidoffset) - 1542 NDR_NTSD_OFFSETOF); 1543 (*pntsd)->dacloffset = cpu_to_le32(le32_to_cpu((*pntsd)->dacloffset) - 1544 NDR_NTSD_OFFSETOF); 1545 1546 rc = acl.sd_size; 1547 out_free: 1548 kfree(acl_ndr.data); 1549 kfree(smb_acl); 1550 kfree(def_smb_acl); 1551 if (rc < 0) { 1552 kfree(acl.sd_buf); 1553 *pntsd = NULL; 1554 } 1555 1556 free_n_data: 1557 kfree(n.data); 1558 return rc; 1559 } 1560 1561 int ksmbd_vfs_set_dos_attrib_xattr(struct mnt_idmap *idmap, 1562 const struct path *path, 1563 struct xattr_dos_attrib *da, 1564 bool get_write) 1565 { 1566 struct ndr n; 1567 int err; 1568 1569 err = ndr_encode_dos_attr(&n, da); 1570 if (err) 1571 return err; 1572 1573 err = ksmbd_vfs_setxattr(idmap, path, XATTR_NAME_DOS_ATTRIBUTE, 1574 (void *)n.data, n.offset, 0, get_write); 1575 if (err) 1576 ksmbd_debug(SMB, "failed to store dos attribute in xattr\n"); 1577 kfree(n.data); 1578 1579 return err; 1580 } 1581 1582 int ksmbd_vfs_get_dos_attrib_xattr(struct mnt_idmap *idmap, 1583 struct dentry *dentry, 1584 struct xattr_dos_attrib *da) 1585 { 1586 struct ndr n; 1587 int err; 1588 1589 err = ksmbd_vfs_getxattr(idmap, dentry, XATTR_NAME_DOS_ATTRIBUTE, 1590 (char **)&n.data); 1591 if (err > 0) { 1592 n.length = err; 1593 if (ndr_decode_dos_attr(&n, da)) 1594 err = -EINVAL; 1595 kfree(n.data); 1596 } else { 1597 ksmbd_debug(SMB, "failed to load dos attribute in xattr\n"); 1598 } 1599 1600 return err; 1601 } 1602 1603 /** 1604 * ksmbd_vfs_init_kstat() - convert unix stat information to smb stat format 1605 * @p: destination buffer 1606 * @ksmbd_kstat: ksmbd kstat wrapper 1607 * 1608 * Returns: pointer to the converted &struct file_directory_info 1609 */ 1610 void *ksmbd_vfs_init_kstat(char **p, struct ksmbd_kstat *ksmbd_kstat) 1611 { 1612 FILE_DIRECTORY_INFO *info = (FILE_DIRECTORY_INFO *)(*p); 1613 struct kstat *kstat = ksmbd_kstat->kstat; 1614 u64 time; 1615 1616 info->FileIndex = 0; 1617 info->CreationTime = cpu_to_le64(ksmbd_kstat->create_time); 1618 time = ksmbd_UnixTimeToNT(kstat->atime); 1619 info->LastAccessTime = cpu_to_le64(time); 1620 time = ksmbd_UnixTimeToNT(kstat->mtime); 1621 info->LastWriteTime = cpu_to_le64(time); 1622 time = ksmbd_UnixTimeToNT(kstat->ctime); 1623 info->ChangeTime = cpu_to_le64(time); 1624 1625 if (ksmbd_kstat->file_attributes & FILE_ATTRIBUTE_DIRECTORY_LE) { 1626 info->EndOfFile = 0; 1627 info->AllocationSize = 0; 1628 } else { 1629 info->EndOfFile = cpu_to_le64(kstat->size); 1630 info->AllocationSize = cpu_to_le64(kstat->blocks << 9); 1631 } 1632 info->ExtFileAttributes = ksmbd_kstat->file_attributes; 1633 1634 return info; 1635 } 1636 1637 int ksmbd_vfs_fill_dentry_attrs(struct ksmbd_work *work, 1638 struct mnt_idmap *idmap, 1639 struct dentry *dentry, 1640 struct ksmbd_kstat *ksmbd_kstat) 1641 { 1642 struct ksmbd_share_config *share_conf = work->tcon->share_conf; 1643 u64 time; 1644 int rc; 1645 struct path path = { 1646 .mnt = share_conf->vfs_path.mnt, 1647 .dentry = dentry, 1648 }; 1649 1650 rc = vfs_getattr(&path, ksmbd_kstat->kstat, 1651 STATX_BASIC_STATS | STATX_BTIME, 1652 AT_STATX_SYNC_AS_STAT); 1653 if (rc) 1654 return rc; 1655 1656 time = ksmbd_UnixTimeToNT(ksmbd_kstat->kstat->ctime); 1657 ksmbd_kstat->create_time = time; 1658 1659 /* 1660 * set default value for the case that store dos attributes is not yes 1661 * or that acl is disable in server's filesystem and the config is yes. 1662 */ 1663 if (S_ISDIR(ksmbd_kstat->kstat->mode)) 1664 ksmbd_kstat->file_attributes = FILE_ATTRIBUTE_DIRECTORY_LE; 1665 else 1666 ksmbd_kstat->file_attributes = FILE_ATTRIBUTE_ARCHIVE_LE; 1667 1668 if (test_share_config_flag(work->tcon->share_conf, 1669 KSMBD_SHARE_FLAG_STORE_DOS_ATTRS)) { 1670 struct xattr_dos_attrib da; 1671 1672 rc = ksmbd_vfs_get_dos_attrib_xattr(idmap, dentry, &da); 1673 if (rc > 0) { 1674 ksmbd_kstat->file_attributes = cpu_to_le32(da.attr); 1675 ksmbd_kstat->create_time = da.create_time; 1676 } else { 1677 ksmbd_debug(VFS, "fail to load dos attribute.\n"); 1678 } 1679 } 1680 1681 return 0; 1682 } 1683 1684 ssize_t ksmbd_vfs_casexattr_len(struct mnt_idmap *idmap, 1685 struct dentry *dentry, char *attr_name, 1686 int attr_name_len) 1687 { 1688 char *name, *xattr_list = NULL; 1689 ssize_t value_len = -ENOENT, xattr_list_len; 1690 1691 xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list); 1692 if (xattr_list_len <= 0) 1693 goto out; 1694 1695 for (name = xattr_list; name - xattr_list < xattr_list_len; 1696 name += strlen(name) + 1) { 1697 ksmbd_debug(VFS, "%s, len %zd\n", name, strlen(name)); 1698 if (strncasecmp(attr_name, name, attr_name_len)) 1699 continue; 1700 1701 value_len = ksmbd_vfs_xattr_len(idmap, dentry, name); 1702 break; 1703 } 1704 1705 out: 1706 kvfree(xattr_list); 1707 return value_len; 1708 } 1709 1710 int ksmbd_vfs_xattr_stream_name(char *stream_name, char **xattr_stream_name, 1711 size_t *xattr_stream_name_size, int s_type) 1712 { 1713 char *type, *buf; 1714 1715 if (s_type == DIR_STREAM) 1716 type = ":$INDEX_ALLOCATION"; 1717 else 1718 type = ":$DATA"; 1719 1720 buf = kasprintf(KSMBD_DEFAULT_GFP, "%s%s%s", 1721 XATTR_NAME_STREAM, stream_name, type); 1722 if (!buf) 1723 return -ENOMEM; 1724 1725 *xattr_stream_name = buf; 1726 *xattr_stream_name_size = strlen(buf) + 1; 1727 1728 return 0; 1729 } 1730 1731 int ksmbd_vfs_copy_file_ranges(struct ksmbd_work *work, 1732 struct ksmbd_file *src_fp, 1733 struct ksmbd_file *dst_fp, 1734 struct srv_copychunk *chunks, 1735 unsigned int chunk_count, 1736 unsigned int *chunk_count_written, 1737 unsigned int *chunk_size_written, 1738 loff_t *total_size_written) 1739 { 1740 unsigned int i; 1741 loff_t src_off, dst_off, src_file_size; 1742 size_t len; 1743 int ret; 1744 1745 *chunk_count_written = 0; 1746 *chunk_size_written = 0; 1747 *total_size_written = 0; 1748 1749 if (!(src_fp->daccess & (FILE_READ_DATA_LE | FILE_EXECUTE_LE))) { 1750 pr_err("no right to read(%pD)\n", src_fp->filp); 1751 return -EACCES; 1752 } 1753 if (!(dst_fp->daccess & (FILE_WRITE_DATA_LE | FILE_APPEND_DATA_LE))) { 1754 pr_err("no right to write(%pD)\n", dst_fp->filp); 1755 return -EACCES; 1756 } 1757 1758 if (ksmbd_stream_fd(src_fp) || ksmbd_stream_fd(dst_fp)) 1759 return -EBADF; 1760 1761 smb_break_all_levII_oplock(work, dst_fp, 1); 1762 1763 if (!work->tcon->posix_extensions) { 1764 for (i = 0; i < chunk_count; i++) { 1765 src_off = le64_to_cpu(chunks[i].SourceOffset); 1766 dst_off = le64_to_cpu(chunks[i].TargetOffset); 1767 len = le32_to_cpu(chunks[i].Length); 1768 1769 if (check_lock_range(src_fp->filp, src_off, 1770 src_off + len - 1, READ)) 1771 return -EAGAIN; 1772 if (check_lock_range(dst_fp->filp, dst_off, 1773 dst_off + len - 1, WRITE)) 1774 return -EAGAIN; 1775 } 1776 } 1777 1778 src_file_size = i_size_read(file_inode(src_fp->filp)); 1779 1780 for (i = 0; i < chunk_count; i++) { 1781 src_off = le64_to_cpu(chunks[i].SourceOffset); 1782 dst_off = le64_to_cpu(chunks[i].TargetOffset); 1783 len = le32_to_cpu(chunks[i].Length); 1784 1785 if (src_off + len > src_file_size) 1786 return -E2BIG; 1787 1788 /* 1789 * vfs_copy_file_range does not allow overlapped copying 1790 * within the same file. 1791 */ 1792 if (file_inode(src_fp->filp) == file_inode(dst_fp->filp) && 1793 dst_off + len > src_off && 1794 dst_off < src_off + len) 1795 ret = do_splice_direct(src_fp->filp, &src_off, 1796 dst_fp->filp, &dst_off, 1797 min_t(size_t, len, MAX_RW_COUNT), 0); 1798 else 1799 ret = vfs_copy_file_range(src_fp->filp, src_off, 1800 dst_fp->filp, dst_off, len, 0); 1801 if (ret == -EOPNOTSUPP || ret == -EXDEV) 1802 ret = vfs_copy_file_range(src_fp->filp, src_off, 1803 dst_fp->filp, dst_off, len, 1804 COPY_FILE_SPLICE); 1805 if (ret < 0) 1806 return ret; 1807 1808 *chunk_count_written += 1; 1809 *total_size_written += ret; 1810 } 1811 return 0; 1812 } 1813 1814 void ksmbd_vfs_posix_lock_wait(struct file_lock *flock) 1815 { 1816 wait_event(flock->c.flc_wait, !flock->c.flc_blocker); 1817 } 1818 1819 void ksmbd_vfs_posix_lock_unblock(struct file_lock *flock) 1820 { 1821 locks_delete_block(flock); 1822 } 1823 1824 int ksmbd_vfs_set_init_posix_acl(struct mnt_idmap *idmap, 1825 const struct path *path) 1826 { 1827 struct posix_acl_state acl_state; 1828 struct posix_acl *acls; 1829 struct dentry *dentry = path->dentry; 1830 struct inode *inode = d_inode(dentry); 1831 int rc; 1832 1833 if (!IS_ENABLED(CONFIG_FS_POSIX_ACL)) 1834 return -EOPNOTSUPP; 1835 1836 ksmbd_debug(SMB, "Set posix acls\n"); 1837 rc = init_acl_state(&acl_state, 1); 1838 if (rc) 1839 return rc; 1840 1841 /* Set default owner group */ 1842 acl_state.owner.allow = (inode->i_mode & 0700) >> 6; 1843 acl_state.group.allow = (inode->i_mode & 0070) >> 3; 1844 acl_state.other.allow = inode->i_mode & 0007; 1845 acl_state.users->aces[acl_state.users->n].uid = inode->i_uid; 1846 acl_state.users->aces[acl_state.users->n++].perms.allow = 1847 acl_state.owner.allow; 1848 acl_state.groups->aces[acl_state.groups->n].gid = inode->i_gid; 1849 acl_state.groups->aces[acl_state.groups->n++].perms.allow = 1850 acl_state.group.allow; 1851 acl_state.mask.allow = 0x07; 1852 1853 acls = posix_acl_alloc(6, KSMBD_DEFAULT_GFP); 1854 if (!acls) { 1855 free_acl_state(&acl_state); 1856 return -ENOMEM; 1857 } 1858 posix_state_to_acl(&acl_state, acls->a_entries); 1859 1860 rc = set_posix_acl(idmap, dentry, ACL_TYPE_ACCESS, acls); 1861 if (rc < 0) 1862 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n", 1863 rc); 1864 else if (S_ISDIR(inode->i_mode)) { 1865 posix_state_to_acl(&acl_state, acls->a_entries); 1866 rc = set_posix_acl(idmap, dentry, ACL_TYPE_DEFAULT, acls); 1867 if (rc < 0) 1868 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n", 1869 rc); 1870 } 1871 1872 free_acl_state(&acl_state); 1873 posix_acl_release(acls); 1874 return rc; 1875 } 1876 1877 int ksmbd_vfs_inherit_posix_acl(struct mnt_idmap *idmap, 1878 const struct path *path, struct inode *parent_inode) 1879 { 1880 struct posix_acl *acls; 1881 struct posix_acl_entry *pace; 1882 struct dentry *dentry = path->dentry; 1883 struct inode *inode = d_inode(dentry); 1884 int rc, i; 1885 1886 if (!IS_ENABLED(CONFIG_FS_POSIX_ACL)) 1887 return -EOPNOTSUPP; 1888 1889 acls = get_inode_acl(parent_inode, ACL_TYPE_DEFAULT); 1890 if (IS_ERR_OR_NULL(acls)) 1891 return -ENOENT; 1892 pace = acls->a_entries; 1893 1894 for (i = 0; i < acls->a_count; i++, pace++) { 1895 if (pace->e_tag == ACL_MASK) { 1896 pace->e_perm = 0x07; 1897 break; 1898 } 1899 } 1900 1901 rc = set_posix_acl(idmap, dentry, ACL_TYPE_ACCESS, acls); 1902 if (rc < 0) 1903 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n", 1904 rc); 1905 if (S_ISDIR(inode->i_mode)) { 1906 rc = set_posix_acl(idmap, dentry, ACL_TYPE_DEFAULT, 1907 acls); 1908 if (rc < 0) 1909 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n", 1910 rc); 1911 } 1912 1913 posix_acl_release(acls); 1914 return rc; 1915 } 1916 1917 void ksmbd_vfs_update_compressed_fattr(struct dentry *dentry, __le32 *fattr) 1918 { 1919 int rc; 1920 struct file_kattr fa = { .flags_valid = true }; 1921 1922 rc = vfs_fileattr_get(dentry, &fa); 1923 if (rc == -ENOIOCTLCMD) 1924 *fattr &= ~FILE_ATTRIBUTE_COMPRESSED_LE; 1925 if (rc) 1926 return; 1927 1928 if (fa.flags & FS_COMPR_FL) 1929 *fattr |= FILE_ATTRIBUTE_COMPRESSED_LE; 1930 else 1931 *fattr &= ~FILE_ATTRIBUTE_COMPRESSED_LE; 1932 } 1933 1934 int ksmbd_vfs_get_compression(struct ksmbd_file *fp, u16 *fmt) 1935 { 1936 struct file_kattr fa = { .flags_valid = true }; 1937 int rc; 1938 1939 rc = vfs_fileattr_get(fp->filp->f_path.dentry, &fa); 1940 if (rc == -ENOIOCTLCMD) { 1941 *fmt = COMPRESSION_FORMAT_NONE; 1942 rc = 0; 1943 goto out; 1944 } 1945 if (rc) 1946 goto out; 1947 1948 if (fa.flags & FS_COMPR_FL) 1949 *fmt = COMPRESSION_FORMAT_LZNT1; 1950 else 1951 *fmt = COMPRESSION_FORMAT_NONE; 1952 1953 out: 1954 return rc; 1955 } 1956 1957 int ksmbd_vfs_set_compression(struct ksmbd_work *work, struct ksmbd_file *fp, u16 fmt) 1958 { 1959 const struct cred *saved_cred = NULL; 1960 struct file_kattr fa; 1961 struct dentry *dentry = fp->filp->f_path.dentry; 1962 struct mnt_idmap *idmap = file_mnt_idmap(fp->filp); 1963 u32 flags; 1964 __le32 old_fattr; 1965 int rc; 1966 1967 if (!(fp->daccess & FILE_WRITE_DATA_LE)) { 1968 rc = -EACCES; 1969 goto out; 1970 } 1971 1972 saved_cred = override_creds(fp->filp->f_cred); 1973 rc = vfs_fileattr_get(dentry, &fa); 1974 if (rc) 1975 goto out; 1976 1977 flags = fa.flags; 1978 if (fmt == COMPRESSION_FORMAT_NONE) { 1979 flags &= ~FS_COMPR_FL; 1980 } else if (fmt == COMPRESSION_FORMAT_DEFAULT || 1981 fmt == COMPRESSION_FORMAT_LZNT1) { 1982 flags |= FS_COMPR_FL; 1983 } else { 1984 rc = -EINVAL; 1985 goto out; 1986 } 1987 1988 if (flags != fa.flags) { 1989 fileattr_fill_flags(&fa, flags); 1990 rc = mnt_want_write_file(fp->filp); 1991 if (rc) 1992 goto out; 1993 1994 rc = vfs_fileattr_set(idmap, dentry, &fa); 1995 mnt_drop_write_file(fp->filp); 1996 if (rc) 1997 goto out; 1998 } 1999 2000 old_fattr = fp->f_ci->m_fattr; 2001 if (fmt == COMPRESSION_FORMAT_NONE) 2002 fp->f_ci->m_fattr &= ~FILE_ATTRIBUTE_COMPRESSED_LE; 2003 else 2004 fp->f_ci->m_fattr |= FILE_ATTRIBUTE_COMPRESSED_LE; 2005 2006 if (fp->f_ci->m_fattr != old_fattr && 2007 test_share_config_flag(work->tcon->share_conf, 2008 KSMBD_SHARE_FLAG_STORE_DOS_ATTRS)) { 2009 struct xattr_dos_attrib da; 2010 2011 rc = ksmbd_vfs_get_dos_attrib_xattr(idmap, dentry, &da); 2012 if (rc <= 0) { 2013 rc = 0; 2014 goto out; 2015 } 2016 2017 da.attr = le32_to_cpu(fp->f_ci->m_fattr); 2018 rc = ksmbd_vfs_set_dos_attrib_xattr(idmap, 2019 &fp->filp->f_path, 2020 &da, true); 2021 if (rc) 2022 rc = 0; 2023 } 2024 2025 out: 2026 if (saved_cred) 2027 revert_creds(saved_cred); 2028 return rc; 2029 } 2030